Producer & Consumer producer and consumer

//Meal.javapackage producer.consumer.demo;public class Meal {    private final int orderNum;    public Meal(int orderNum) {this.orderNum = orderNum;    }    public String toString() {return "Meal " + orderNum;    }}//Chef.javapackage producer.consumer.demo;import java.util.concurrent.TimeUnit;public class Chef implements Runnable{    private Restaurant restaurant;    private int count = 0;    public Chef(Restaurant r) {restaurant = r;    }    public void run() {try {    while (!Thread.interrupted()) {synchronized (this) {    while (restaurant.meal != null)wait(); // ... for the meal to be taken}if (++count == 10) {    System.out.println("Out of food, closing");    restaurant.exec.shutdownNow();}System.out.println("Order up! ");synchronized (restaurant.waitPerson) {    restaurant.meal = new Meal(count);    restaurant.waitPerson.notifyAll();}TimeUnit.MILLISECONDS.sleep(100);    }} catch (InterruptedException e) {    System.out.println("Chef interrupted");}    }}//WaitPerson.javapackage producer.consumer.demo;public class WaitPerson implements Runnable{    private Restaurant restaurant;    public WaitPerson(Restaurant r) {restaurant = r;    }    public void run() {try {    while (!Thread.interrupted()) {synchronized (this) {    while (restaurant.meal == null)wait(); // ... for the chef to produce a meal}System.out.println("Waitperson got " + restaurant.meal);synchronized (restaurant.chef) {    restaurant.meal = null;    restaurant.chef.notifyAll(); // Ready for another}    }} catch (InterruptedException e) {    System.out.println("WaitPerson interrupted");}    }}//Restaurant.javapackage producer.consumer.demo;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Restaurant {    Meal meal;    ExecutorService exec = Executors.newCachedThreadPool();    WaitPerson waitPerson = new WaitPerson(this);    Chef chef = new Chef(this);    public Restaurant() {exec.execute(chef);exec.execute(waitPerson);    }    public static void main(String[] args) {new Restaurant();    }}

　　

From: Thinking in Java.